Commuter rail agencies provide mobility to millions of people across the country, often using Amtrak infrastructure and services. Given these interactions, an abrupt Amtrak cessation could have a significant impact on commuter rail operations. Amtrak's chronic financial problems and recent budget proposals make such cessation possibility. This book was asked to examine:(1) The extent to which commuter rail agencies rely on Amtrak for access to infrastructure and services,(2) Issues that commuter rail agencies would face if Amtrak abruptly ceased to provide them with services and infrastructure access, and(3) The options available to commuter rail agencies should Amtrak abruptly cease to provide those services and infrastructure access.